All you have to do.
You just buy fuel additive. We call it red stuff. It’s fuel stabilizer and you guessed it Red! That will let it sit much much longer then two weeks. The problem is the gaskets and things that need to stay lubricated etc the vehicle needs to run a little about every few weeks. Let it get all the way to operating temp and the tires need to roll and drive to the store or across town. You’ll be good if you follow that. The battery will stay charged if you start it from time to time. If after 2 weeks your car doesn’t start you have a drain somewhere. I.e. ext radio, CB, light anything that is wired so that it can turn on when the car is off will drain your battery over a few weeks. You CAN have it wired were it won’t drain your battery. Then this just means you can use whatever you’re wanting to use unless the car is on. But then it won’t work but also won’t drain the battery, maybe this will help someone.